如何釋放結構體數組

Question

我有一個struct complex和一個struct complex_set （一組復數），並且我有“ constructor”和“ destructor”函數alloc_set和free_set 。

我的問題是，在free_set中的for循環的第二次迭代中出現以下錯誤：

malloc: *** error for object 0x1001054f0: pointer being freed was not allocated

反初始化complex_set的正確方法是什么？ 我想知道是否需要僅通過在第一個點上調用free來釋放complex_set的*points屬性（然后它將釋放其余的點）還是分別釋放每個元素？ 還是我在初始化中已經做錯了什么？

這是代碼：

typedef struct complex complex;
typedef struct complex_set complex_set;

struct complex { double a; double b; };
struct complex_set {
    int num_points_in_set;
    complex *points; // an array of struct complex
};

struct complex_set *alloc_set(complex c_arr[], int size) {
    complex_set *set = (complex_set *) malloc(sizeof(complex_set));
    set->num_points_in_set = size;
    // i think i may even just use the pointer c_arr as '*points'
    // however, i want to make sure malloc was called
    set->points = (complex *) malloc(size*sizeof(complex));
    for (int i=0; i<size; i++) {
        set->points[i] = c_arr[i];
    }
    return set;
}

void free_set(complex_set *set) {
    complex *current = set->points;
    complex *next = NULL;
    int iterations = set->num_points_in_set;
    for(int i=0; i<iterations; i++) {
        next = current + 1;
        // i get the error here, in the second iteration:
        free(current);
        current = next;
    }
    free(set);
    set = NULL;
}

Answer 1

您只對set->points了一個malloc() ，因此您只應對free() 。

您正在嘗試釋放每個點。

Answer 2

就這么簡單： free(set->points);